The KSALEX rail shoulder is pre-inserted in the concrete tie&period; There are M&period;C&period;I&period; shoulder manufactured from malleable iron and S&period;G&period;C&period;I&period; shoulder manufactured from malleable iron and S&period;G&period;C&period;I&period; shoulder from spheroid graphite iron&period; We offer two types of iron shoulders&period; One is Single Stem Iron Shoulder used in pre-stressed concrete ties and the other is Twin Stem Iron Shoulder used in Bi-Block or Twin Block concrete ties&period;Iron KSALEX rail shoulder material technical parameter